<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			.	a{
				height: 400px;
				width: 400px;
				
				border: 1px solid red;
			}
			.b{
				padding: 25% 50%;
				background-color: #00FFFF;
			}
		</style>
	</head>
	<body>
		<div class="a"><div class="b"></div></div>
	</body>
</html>
